package site.eblog.security;

import java.security.Key;
import java.security.SecureRandom;

import javax.crypto.Cipher;
import javax.crypto.KeyGenerator;
import javax.crypto.SecretKey;
import javax.crypto.SecretKeyFactory;
import javax.crypto.spec.DESKeySpec;
import javax.crypto.spec.IvParameterSpec;
import javax.crypto.spec.SecretKeySpec;

public class MyAES {
	 private static final String AES = "AES";  
	  
	    private static final String CRYPT_KEY = "!^KGBI(SOOTY^#&5";  
	  
	    /** 
	     * 加密 
	     *  
	     * @param encryptStr 
	     * @return 
	     */  
	    public static byte[] encrypt(byte[] src, String key) throws Exception {  
	        Cipher cipher = Cipher.getInstance(AES);  
	        SecretKeySpec securekey = new SecretKeySpec(key.getBytes(), AES);  
	        cipher.init(Cipher.ENCRYPT_MODE, securekey);//设置密钥和加密形式  
	        return cipher.doFinal(src);  
	    }  
	  
	    /** 
	     * 解密 
	     *  
	     * @param decryptStr 
	     * @return 
	     * @throws Exception 
	     */  
	    public static byte[] decrypt(byte[] src, String key)  throws Exception  {  
	        Cipher cipher = Cipher.getInstance(AES);  
	        SecretKeySpec securekey = new SecretKeySpec(key.getBytes(), AES);//设置加密Key  
	        cipher.init(Cipher.DECRYPT_MODE, securekey);//设置密钥和解密形式  
	        return cipher.doFinal(src);  
	    }  
	      
	    /** 
	     * 二行制转十六进制字符串 
	     *  
	     * @param b 
	     * @return 
	     */  
	    public static String byte2hex(byte[] b) {  
	        String hs = "";  
	        String stmp = "";  
	        for (int n = 0; n < b.length; n++) {  
	            stmp = (java.lang.Integer.toHexString(b[n] & 0XFF));  
	            if (stmp.length() == 1)  
	                hs = hs + "0" + stmp;  
	            else  
	                hs = hs + stmp;  
	        }  
	        return hs.toUpperCase();  
	    }  
	  
	    public static byte[] hex2byte(byte[] b) {  
	        if ((b.length % 2) != 0)  
	            throw new IllegalArgumentException("长度不是偶数");  
	        byte[] b2 = new byte[b.length / 2];  
	        for (int n = 0; n < b.length; n += 2) {  
	            String item = new String(b, n, 2);  
	            b2[n / 2] = (byte) Integer.parseInt(item, 16);  
	        }  
	        return b2;  
	    }  
	      
	    /** 
	     * 解密 
	     *  
	     * @param data 
	     * @return 
	     * @throws Exception 
	     */  
	    public final static String decrypt(String data) {  
	        try {  
	            return new String(decrypt(hex2byte(data.getBytes()),  
	                    CRYPT_KEY));  
	        } catch (Exception e) {  
	        }  
	        return null;  
	    }  
	  
	    /** 
	     * 加密 
	     *  
	     * @param data 
	     * @return 
	     * @throws Exception 
	     */  
	    public final static String encrypt(String data) {  
	        try {  
	            return byte2hex(encrypt(data.getBytes(), CRYPT_KEY));  
	        } catch (Exception e) {  
	        }  
	        return null;  
	    }  
	      
	  
	    public static void main(String[] args) {  
	        String ID = "x";  
	          
	        String idEncrypt = encrypt(ID);  
	        System.out.println(idEncrypt);  
	        String idDecrypt = decrypt(idEncrypt);  
	        System.out.println(idDecrypt); 
	    }  
}
